CN112277179A - Wet mixing method for styrene-butadiene latex and natural latex by using raw rubber - Google Patents

Wet mixing method for styrene-butadiene latex and natural latex by using raw rubber Download PDF

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CN112277179A
CN112277179A CN202011291571.7A CN202011291571A CN112277179A CN 112277179 A CN112277179 A CN 112277179A CN 202011291571 A CN202011291571 A CN 202011291571A CN 112277179 A CN112277179 A CN 112277179A
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rubber
styrene
latex
mixing
natural
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汪传生
王禄银
王晓明
隋雁俊
边慧光
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Qingdao University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/005—Methods for mixing in batches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/823—Temperature control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C08L9/08—Latex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

The invention belongs to the technical field of rubber wet mixing, and particularly relates to a styrene-butadiene latex natural latex and raw rubber wet mixing method, wherein the specific process comprises four steps of preparing styrene-butadiene/natural rubber mixed emulsion, preparing a styrene-butadiene/natural rubber composite material, mixing and vulcanizing, the styrene-butadiene latex and the natural latex are mixed, flocculated and dried, the styrene-butadiene/natural rubber composite material with uniform quality and high processability is prepared by using a wet mixing process for mixing, the physical property and the dynamic mechanical property of the mixed rubber are remarkably improved compared with those of the mixed rubber prepared by the traditional mixing process, the production period is shortened, the problem of polymer process compatibility is solved, and the mixing procedure is simplified; the method has the advantages of simple operation steps, high preparation efficiency, continuous processing mode, no use of acid, reduction of environmental pollution, avoidance of influence of acid residue on rubber performance, environmental friendliness and low energy consumption.

Description

Wet mixing method for styrene-butadiene latex and natural latex by using raw rubber
The technical field is as follows:
the invention belongs to the technical field of rubber wet mixing, and particularly relates to a styrene-butadiene latex natural latex and raw rubber wet mixing method, which can shorten the production period, improve the compatibility among different rubber types and improve the rubber performance.
Background art:
styrene-butadiene rubber and natural rubber are one of the main base materials in the rubber product industry, and the styrene-butadiene rubber is superior to the natural rubber in the performances of wear resistance, aging resistance, heat resistance and the like, but is inferior to the natural rubber in strength, elasticity, flex crack resistance and processability, so that the styrene-butadiene rubber and the natural rubber are mixed in the rubber product, and the performance of the rubber product can be synergistically improved.
The natural rubber and the styrene-butadiene latex firstly solidify or coagulate the latex when preparing the natural rubber and the styrene-butadiene rubber, and then carry out the steps of cleaning, drying and the like, wherein the solidification or coagulation process is an important step for preparing the solid rubber, and usually needs some chemical reagents such as acid and salt, however, the use of the chemical reagents can cause environmental pollution and influence the performance of the rubber product.
The mixing is the most critical process in the processing process of rubber products, and aims to fully mix the rubber and the rubber in the formula and the rubber auxiliary agent and the rubber and disperse the materials uniformly as much as possible. At present, the traditional mixing method in the rubber industry is a multi-stage kneading or shearing mixing method using an internal mixer or an open mill, and because the physical properties of polymers are different, the problem of process compatibility exists, and the process compatibility refers to the capability of forming a stable homogeneous system when multiple polymers are blended in any proportion. From a thermodynamic perspective, most blends of currently known polymers suffer from incompatibility problems, making it difficult to achieve molecular or segment level mixing.
In order to break through the limitation brought by the traditional mechanical mixing and the physical property of the polymer, a wet mixing process can be utilized: mixing two different substances in liquid state to form a mixed emulsion, and promoting the substances to be mutually dispersed and distributed to form a homogeneous phase, for example: the Chinese patent 201811319015.9 discloses a wet mixing process for synthetic rubber, which comprises the following steps: step S1, liquid preparation: putting synthetic rubber into a container, dropwise adding the white carbon black emulsion into the synthetic rubber at a stirring speed of 600r/min, stirring for 30min at 1000r/min after dropwise adding is finished, uniformly mixing the emulsion, reducing the stirring speed to 800r/min, sequentially adding sulfamic acid, an accelerator NS, stearic acid and an anti-aging agent into the emulsion under stirring, and continuously stirring for 45-48min after the adding is finished to obtain a latex mixed solution; step S2, agglomeration: the latex mixed liquid is condensed on the inner wall of the mixing chamber; step S3, collecting: the condensed liquid flows out along the inner wall of the mixing chamber and is collected to obtain a rubber mixture; step S4, stirring: stirring the rubber mixture in a rubber wet mixer, wherein the stirring process parameters comprise a stirring speed of 300-; step S5, drying: flocculating, washing glue and removing solvent from the stirred mixture to obtain wet mixing synthetic rubber; the method comprises the following specific steps: putting the solidified latex mixture into a rubber washing machine for desolventizing, simultaneously washing the latex mixture by using tap water, putting the rubber sheet subjected to desolventizing by the rubber washing machine into a 75 ℃ drying oven for drying for 7-8h, adjusting the temperature of the drying oven to 150 ℃, drying the rubber sheet for 110-115s, taking out, putting the dried rubber sheet on an open mill for supplementary mixing, and under the condition that the gap between rollers of the open mill is minimum, rolling the rubber sheet on the open mill for ten times to obtain a sheet, so as to obtain final rubber, and vulcanizing the prepared rubber compound on a flat vulcanizing machine for 15min at the pressure of 150 ℃ and 10MPa to obtain synthetic rubber; the method for preparing carbon black master batch by wet mixing disclosed in Chinese patent 201710839208.6 comprises the following steps: treating carbon black with a surfactant to prepare uniformly dispersed carbon black slurry, and stirring at a rotating speed of 300-600 m/min for 20-60 min to prepare the carbon black slurry; adding rubber latex into carbon black slurry, stirring at the rotating speed of 100-300 m/min for 20-50 min, flocculating latex and carbon black, filtering and drying; wherein the mass percent of the carbon black slurry is 2-8%; the surfactant is at least one of n-butanol, glucose, polyethylene glycol, fatty alcohol polyoxyethylene ether-9, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; the adding amount of the carbon black is 30-80 parts and the adding amount of the surfactant is 1-5 parts based on 100 parts of the dry rubber in the rubber latex; the method for wet mixing disclosed in chinese patent 201410345431.1 is to select an impregnating compound to soak the filler to prepare an evenly dispersed filler aqueous solution, wherein the filler aqueous solution has a mass percentage of 2-20%; the adding amount of the filler in the filler water solution is 3-80 parts by taking the mass of the dry glue in the latex as 100 parts; the adding amount of the impregnating compound is 10-200 parts; the filler is carbon black, organic modified white carbon black, organic modified clay or a mixture of the fillers; the impregnating compound is ethanol; after the slurry is dispersed, mixing the slurry with latex with the mass percentage of 10-40% in a pipeline for preflocculation; then mixing the mixture into a composite flocculant; flocculating at stirring speed of 10-250m/min and temperature of 40-80 deg.C, cleaning flocculate particles, dewatering, and oven drying to obtain rubber nanometer composite masterbatch; in the composite flocculant, the volume ratio of a calcium chloride solution to a sodium chloride solution is 1:2-2:1, wherein the mass fraction of calcium chloride is 0.5-3%, and the mass fraction of sodium chloride is 1-3%; the preparation method of the wet-process mixing natural rubber material disclosed in the chinese patent 201110064299.3, a, preparing slurry comprising white carbon black dry material, deionized water, coupling agent and surfactant, the preparation procedure is: 1) soaking 15-40% of white carbon black dry material in 60-85% of deionized water for 3-6 hours; 2) adding a coupling agent accounting for 1-10% of the content of the dry white carbon black and a surfactant accounting for 0.2-5%, and mechanically stirring to uniformly mix the dry white carbon black, the coupling agent and the surfactant to prepare white carbon black slurry; B. grinding the slurry by a grinding machine until the sedimentation amount of the white carbon black aqueous dispersion is less than 80 mg/h; C. preparing latex mixed solution 1), taking field latex of natural rubber with dry rubber content of 15-60% or centrifugally concentrated natural latex; 2) adding the prepared white carbon black aqueous dispersion into latex, and stirring for 20-50 minutes at normal temperature; 3) uniformly mixing latex and the aqueous dispersion of white carbon black to form a latex mixed solution; D. flocculation, glue washing and dehydration 1), adding 0.3-1% acetic acid of the total amount of the mixed solution into the mixed solution after uniform mixing to ensure that the pH value is 3-5, and uniformly flocculating latex and co-precipitating with white carbon black; 2) washing the solidified rubber material with clear water to remove redundant acetic acid, and washing the rubber material with a rubber washing machine to remove rubber and water; 3) feeding the dehydrated rubber material to a rubber granulator for granulation, and then feeding the rubber material granules into a box type drying cabinet for drying at the temperature of 90-120 ℃ for 4-6 hours; E. and (4) drying completely to obtain the natural rubber mixing material.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and develops a styrene-butadiene latex natural latex and raw rubber wet mixing method, so that the problem of process compatibility of polymers is solved, the mixing procedure is simplified, the pollution is reduced, and the performance of rubber products is improved.
In order to achieve the purpose, the concrete process of the styrene-butadiene latex natural latex and raw rubber wet mixing method comprises four steps of preparing styrene-butadiene/natural rubber mixed emulsion, preparing styrene-butadiene/natural rubber composite material, mixing and vulcanizing:
preparing a butylbenzene/natural rubber mixed emulsion: mixing styrene-butadiene latex and natural latex according to the mass ratio of 2.319-7.288:1, and uniformly stirring to obtain styrene-butadiene/natural latex mixed emulsion;
(II) preparing a butylbenzene/natural rubber composite material: carrying out flocculation drying on the butylbenzene/natural rubber mixed emulsion prepared in the step (I) in a spray atomization mode to obtain a butylbenzene/natural rubber composite material;
(III) mixing: mixing butylbenzene/natural rubber composite material and SiO2Adding (silicon dioxide), N234 (carbon black), V700 (environment-friendly aromatic oil), microcrystalline WAX (B-WAX), SAD (stearic acid), Si69 (silane coupling agent), 4020 (antioxidant), ZnO (zinc oxide) and RD (accelerator TMQ) into an internal mixer for mixing, wherein the mixing temperature is 100 ℃, the rotation speed is 90r/min, and the rubber discharge temperature is 145 ℃ for one minute to obtain rubber compound;
(IV) adding sulfur: 231.725g of the rubber compound were subjected to thin-pass 6 times with 1.8 parts by mass of S (sulfur) and 1.3 parts by mass of CZ (N-cyclohexyl-2-benzothiazolesulfenamide) in an open mill to obtain a final rubber compound.
The mass percentage concentration of the natural latex related to the step (one) of the invention is 60 percent; the stirring frequency is 40 Hz; the stirring time was 10 min.
The spraying pressure of the spraying atomization related to the step (II) of the invention is 1.2MPa, and the drying temperature is 135 ℃.
The butylbenzene/natural rubber composite material and SiO related to the third step of the invention2N234, V700, microcrystalline wax, SAD, Si69, 4020, ZnO, and RD in mass fractions of: 124.38, 35, 50, 8, 1.5, 4.55, 2.3, 2, and 2.
The invention relates to a styrene-butadiene latex natural latex and master batch mixing method, which has the following principle: the speed difference between the material solution and the compressed air enables the material solution to be split and broken under the disturbance of the compressed air, so that the atomization effect is achieved, and the latex particles and the styrene-butadiene latex particles are fully mixed to form mixed liquid drops; then, the mixed liquid drop collides with the surface of a high-temperature object, and is subjected to splashing blasting to realize secondary dispersion combination between the latex particles and the styrene-butadiene latex particles; when the mixed liquid drops are exploded, the water in the mixed liquid drops is evaporated to dryness rapidly at high temperature, so that the aggregation of single rubber hydrocarbon is avoided, and the high dispersion state of the components is kept.
Compared with the prior art, the styrene-butadiene latex and the natural latex are mixed, flocculated and dried, and the styrene-butadiene/natural rubber composite material with uniform quality and high processing performance is prepared by a wet mixing process for mixing, so that the physical performance and the dynamic mechanical performance of the mixed rubber are remarkably improved compared with those of the mixed rubber prepared by the traditional mixing process, the production period is shortened, the problem of polymer process compatibility is solved, and the mixing procedure is simplified; the method has the advantages of simple operation steps, high preparation efficiency, continuous processing mode, no use of acid, pollution reduction, avoidance of influence of acid residue on rubber performance, environmental protection and low energy consumption.
The specific implementation mode is as follows:
the following is a further description by way of examples.
Example 1:
the concrete process of the styrene-butadiene latex natural latex and raw rubber wet mixing method related to the embodiment comprises four steps of preparing carboxyl-styrene-butadiene/natural rubber mixed emulsion, preparing carboxyl-styrene-butadiene/natural rubber composite material, mixing and vulcanizing:
preparing a carboxyl-butylbenzene/natural rubber mixed emulsion: 135.42g of carboxyl-butylbenzene latex with the mass percentage concentration of 66% and 58.4g of natural latex with the mass percentage concentration of 60% are mixed, and then stirred for 10min under the condition that the frequency is 40Hz to obtain carboxyl-butylbenzene/natural latex mixed emulsion;
(II) preparing a carboxyl-butylbenzene/natural rubber composite material: 193.82g of the carboxyl-butylbenzene/natural rubber mixed emulsion prepared in the step one is subjected to flocculation drying in a spray atomization mode under the conditions that the spray pressure is 1.2MPa and the drying temperature is 135 ℃ to obtain a carboxyl-butylbenzene/natural rubber composite material;
(III) mixing: 124.38g of the carboxyl-butylbenzene/natural rubber composite material prepared in the step (III) and 35 parts by mass of SiO2(silicon dioxide), 50 parts by mass of N234 (carbon black), 8 parts by mass of V700 (environment-friendly aromatic oil), 1.5 parts by mass of microcrystalline WAX (B-WAX), 2 parts by mass of SAD (stearic acid), 4.55 parts by mass of Si69 (silane coupling agent), 2.3 parts by mass of 4020 (anti-aging agent), 2 parts by mass of ZnO (zinc oxide) and 2 parts by mass of RD (accelerator TMQ) are put into an internal mixer for mixing, the mixing temperature is 100 ℃, the rotating speed is 90r/min, and the rubber discharge temperature condition is 145 ℃ and is kept for one minute, so that mixed rubber is obtained;
(IV) adding sulfur: 231.725g of the rubber compound prepared in the step (IV) was subjected to thin-pass 6 times with 1.8 parts by mass of S (sulfur) and 1.3 parts by mass of CZ (N-cyclohexyl-2-benzothiazolesulfenamide) in an open mill to obtain a final rubber compound.
Example 2:
the concrete process of the styrene-butadiene latex natural latex and raw rubber wet mixing method related to the embodiment comprises four steps of preparing emulsion-styrene-butadiene/natural rubber mixed emulsion, preparing emulsion-styrene-butadiene/natural rubber composite material, mixing and vulcanizing:
preparing an emulsion-butylbenzene/natural rubber mixed emulsion: mixing 425.6g of emulsion-styrene-butadiene latex with the mass percentage concentration of 21% and 58.4g of natural latex with the mass percentage concentration of 60%, and stirring for 10min under the condition that the frequency is 40Hz to obtain emulsion-styrene-butadiene/natural rubber mixed emulsion;
(II) preparing an emulsion-butylbenzene/natural rubber composite material: 193.82g of the emulsion-butylbenzene/natural rubber mixed emulsion prepared in the step one is subjected to flocculation drying in a spray atomization mode under the conditions that the spray pressure is 1.2MPa and the drying temperature is 135 ℃ to obtain an emulsion-butylbenzene/natural rubber composite material;
(III) mixing: 124.38g of the emulsified-butylbenzene/natural rubber composite material prepared in the step (III) and 35 parts by mass of SiO2(silicon dioxide), 50 parts by mass of N234 (carbon black), 8 parts by mass of V700 (environment-friendly aromatic oil), 1.5 parts by mass of microcrystalline WAX (B-WAX), 2 parts by mass of SAD (stearic acid), 4.55 parts by mass of Si69 (silane coupling agent), 2.3 parts by mass of 4020 (anti-aging agent), 2 parts by mass of ZnO (zinc oxide) and 2 parts by mass of RD (accelerator TMQ) are put into an internal mixer for mixing, the mixing temperature is 100 ℃, the rotating speed is 90r/min, and the rubber discharge temperature condition is 145 ℃ and is kept for one minute, so that mixed rubber is obtained;
(IV) adding sulfur: 231.725g of the rubber compound prepared in the step (IV) was subjected to thin-pass 6 times with 1.8 parts by mass of S (sulfur) and 1.3 parts by mass of CZ (N-cyclohexyl-2-benzothiazolesulfenamide) in an open mill to obtain a final rubber compound.
Example 3:
this example relates to the comprehensive performance test of the final rubber compound, which is listed as a dry method as a comparative experiment, and the test results of the comprehensive performance of the final rubber compound are as follows:
Figure BDA0002783943920000061
Figure BDA0002783943920000071
it is shown that the physical properties of the final compounds of examples 1 and 2 are superior to those of the dry-mixed final compounds, wherein the tensile strength is increased by 16.7% and 23.2% respectively, and the 300% stress at elongation is increased by 108.8% and 71.6% respectively; in the process of preparing the composite material in the embodiment 1 and the embodiment 2, the styrene-butadiene rubber and the natural rubber are firstly mixed in the form of latex particles to realize the mixing of molecules or chain segments, and then the styrene-butadiene rubber and the natural rubber are further contacted and mixed through the processes of spray atomization and flocculation drying, so that the process compatibility is improved, the coordination degree is higher, and the performance of a rubber product is improved.

Claims (5)

1. A styrene-butadiene latex natural latex and raw rubber wet mixing method is characterized in that the specific process comprises four steps of preparing styrene-butadiene/natural rubber mixed emulsion, preparing styrene-butadiene/natural rubber composite material, mixing and vulcanizing:
preparing a butylbenzene/natural rubber mixed emulsion: mixing styrene-butadiene latex and natural latex according to the mass ratio of 2.319-7.288:1, and uniformly stirring to obtain styrene-butadiene/natural latex mixed emulsion;
(II) preparing a butylbenzene/natural rubber composite material: carrying out flocculation drying on the butylbenzene/natural rubber mixed emulsion prepared in the step (I) in a spray atomization mode to obtain a butylbenzene/natural rubber composite material;
(III) mixing: mixing butylbenzene/natural rubber composite material and SiO2N234, V700, microcrystalline wax, SAD, Si69, 4020, ZnO and RD are put into an internal mixer for mixing, the mixing temperature is 100 ℃, the rotation speed is 90r/min, and the rubber discharge temperature is 145 ℃ for one minute to obtain mixed rubber;
(IV) adding sulfur: 231.725g of the rubber compound was thinly passed through an open mill 6 times with 1.8 parts by mass of S and 1.3 parts by mass of CZ to obtain a final rubber compound.
2. The process of claim 1, wherein the natural latex is 60 wt%; the stirring frequency is 40 Hz; the stirring time was 10 min.
3. The process for mixing natural latex of styrene-butadiene latex with raw rubber according to claim 1 or 2, wherein the injection pressure of the injection atomization in the step (II) is 1.2MPa and the drying temperature is 135 ℃.
4. The process for wet mixing of styrene-butadiene latex natural latex with raw rubber according to any one of claims 1 to 3, wherein the step (III) involves a styrene-butadiene/natural rubber composite, SiO2N234, V700, microcrystalline wax, SAD, Si69, 4020, ZnO, and RD in mass fractions of: 124.38, 35, 50, 8, 1.5, 4.55, 2.3, 2, and 2.
5. The method of claim 4, wherein the mixing of the natural latex of styrene-butadiene latex with the raw rubber is carried out by the following steps: the speed difference between the material solution and the compressed air enables the material solution to be split and broken under the disturbance of the compressed air, so that the atomization effect is achieved, and the latex particles and the styrene-butadiene latex particles are fully mixed to form mixed liquid drops; then, the mixed liquid drop collides with the surface of a high-temperature object, and is subjected to splashing blasting to realize secondary dispersion combination between the latex particles and the styrene-butadiene latex particles; when the mixed liquid drops are exploded, the water in the mixed liquid drops is evaporated to dryness rapidly at high temperature, so that the aggregation of single rubber hydrocarbon is avoided, and the high dispersion state of the components is kept.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113480743A (en) * 2021-05-31 2021-10-08 中国工程物理研究院材料研究所 Composite latex capable of preparing high-performance flexible product and matching process thereof
CN114805640A (en) * 2022-04-20 2022-07-29 青岛科技大学 Non-acid flocculation method of styrene-butadiene latex

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